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vendor/rails/activerecord/lib/active_record/dynamic_scope_match.rb

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module ActiveRecord

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  class DynamicScopeMatch

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    def self.match(method)

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      ds_match = self.new(method)

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      ds_match.scope ? ds_match : nil

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    end

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    def initialize(method)

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      @scope = true

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      case method.to_s

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      when /^scoped_by_([_a-zA-Z]\w*)$/

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        names = $1

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      else

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        @scope = nil

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      end

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      @attribute_names = names && names.split('_and_')

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    end

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    attr_reader :scope, :attribute_names

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    def scope?

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      !@scope.nil?

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    end

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  end

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end

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